SH1106 characters turning solid white

[Saihaan06]

I seem to be having a pretty weird issue, whenever I try to change voltmeter is display_meas() to mode, in this screenshot

to this:

my display just stops working properly, even for the initial set up message i have, it just shows these characters:

even if i change the code to something like this it still does the same thing:

mode is either 1 or 0 and ohmmeter is 1 and voltmeter is 0, so why does switching these have any effect on the display?

[olikraus]

Not sure how I can help here. Looks like an issue in "display_meas"